LOS ANGELES – FEBRUARY 1967: Country Singer Glen Campbell poses for a portrait in February 1967 in Los Angeles, California. (Photo by Michael Ochs Archives/Getty Images)
ATLANTA – December 11: Singer/Songwriter Willie Nelson performs live at The Omni Coliseum in Atlanta Georgia. December 11, 1981 (Photo By Rick Diamond/Getty Images)
UNITED STATES – APRIL 30: JOHNNY CASH – "The Johnny Cash Show" – 4/30/69, Johnny Cash, (Photo by ABC Photo Archives/Disney General Entertainment Content via Getty Images)
THE TONIGHT SHOW WITH JAY LENO — Episode 1639 — Pictured: (l-r) Musical guest Tim McGraw performing on July 12, 1999 — (Photo by: Paul Drinkwater/NBCU Photo Bank/NBCUniversal via Getty Images via Getty Images)
Willie Nelson performing live at the Hammersmith Apollo, London with 'Trigger', his trusty Martin N-20 guitar. (Photo by Howard Denner/Avalon/Getty Images)
